15254 %ymm registers not restored after signal handler
15367 x86 getfpregs() summons corrupting %xmm ghosts
15333 want x86 /proc xregs support (libc_db, libproc, mdb, etc.)
15336 want libc functions for extended ucontext_t
15334 want ps_lwphandle-specific reg routines
15328 FPU_CW_INIT mistreats reserved bit
15335 i86pc fpu_subr.c isn't really platform-specific
15332 setcontext(2) isn't actually noreturn
15331 need <sys/stdalign.h>
Change-Id: I7060aa86042dfb989f77fc3323c065ea2eafa9ad
Conflicts:
    usr/src/uts/common/fs/proc/prcontrol.c
    usr/src/uts/intel/os/archdep.c
    usr/src/uts/intel/sys/ucontext.h
    usr/src/uts/intel/syscall/getcontext.c

@@ -178,13 +178,19 @@
                 Lalt_stack.3proc                \
                 Lclearfault.3proc               \
                 Lclearsig.3proc                 \
                 Ldstop.3proc                    \
                 Lgetareg.3proc                  \
+                Lgetfpregs.3proc                \
+                Lgetregs.3proc                  \
+                Lgetxregs.3proc                 \
                 Lmain_stack.3proc               \
                 Lputareg.3proc                  \
+                Lsetfpregs.3proc                \
+                Lsetregs.3proc                  \
                 Lsetrun.3proc                   \
+                Lsetxregs.3proc                 \
                 Lstack.3proc                    \
                 Lstop.3proc                     \
                 Lsync.3proc                     \
                 Lwait.3proc                     \
                 Lxecbkpt.3proc                  \

@@ -199,10 +205,11 @@
                 Plmid_to_ctf.3proc              \
                 Plmid_to_loadobj.3proc          \
                 Plmid_to_map.3proc              \
                 Plookup_by_name.3proc           \
                 Plwp_alt_stack.3proc            \
+                Plwp_freexregs.3proc            \
                 Plwp_getfpregs.3proc            \
                 Plwp_iter_all.3proc             \
                 Plwp_main_stack.3proc           \
                 Plwp_setasrs.3proc              \
                 Plwp_setfpregs.3proc            \

@@ -353,10 +360,14 @@
 Pxlookup_by_name.3proc          := LINKSRC = Plookup_by_addr.3proc
 
 Plwp_setregs.3proc              := LINKSRC = Plwp_getregs.3proc
 Plwp_getfpregs.3proc            := LINKSRC = Plwp_getregs.3proc
 Plwp_setfpregs.3proc            := LINKSRC = Plwp_getregs.3proc
+Lgetfpregs.3proc                := LINKSRC = Plwp_getregs.3proc
+Lsetfpregs.3proc                := LINKSRC = Plwp_getregs.3proc
+Lgetregs.3proc                  := LINKSRC = Plwp_getregs.3proc
+Lsetregs.3proc                  := LINKSRC = Plwp_getregs.3proc
 
 Plwp_alt_stack.3proc            := LINKSRC = Plwp_stack.3proc
 Plwp_main_stack.3proc           := LINKSRC = Plwp_stack.3proc
 Lalt_stack.3proc                := LINKSRC = Plwp_stack.3proc
 Lmain_stack.3proc               := LINKSRC = Plwp_stack.3proc

@@ -429,11 +440,14 @@
 proc_str2sigset.3proc           := LINKSRC = proc_str2fltset.3proc
 proc_str2sysset.3proc           := LINKSRC = proc_str2fltset.3proc
 
 proc_get_ldt.3proc              := LINKSRC = Pldt.3proc
 
+Plwp_freexregs.3proc            := LINKSRC = Plwp_getxregs.3proc
 Plwp_setxregs.3proc             := LINKSRC = Plwp_getxregs.3proc
+Lgetxregs.3proc                 := LINKSRC = Plwp_getxregs.3proc
+Lsetxregs.3proc                 := LINKSRC = Plwp_getxregs.3proc
 
 Plwp_setasrs.3proc              := LINKSRC = Plwp_getasrs.3proc
 
 .KEEP_STATE: